Directional switched beam antenna

Details Directional switched beam antenna Directional switched beam antenna

1992-04-29

1993-06-15

Hille, Rolf

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

052203409

ABSTRACT:
A switched beam antenna comprising several spiral arms with a common axis of rotation and respective inner ends angularly spaced around a common circle generates high gain directional beams at an angle away from the antenna axis. Beam scanning is accomplished by rotating the feed to the arms by means of a commutator circuit. Intermediate beams may be generated by feeding two adjacent antenna terminals simultaneously but with an appropriate phase shift. A comparator may be provided to compare signals from several arms and select the arm yielding maximum signal strength.

REFERENCES:
patent: 3039099 (1959-06-01), Chait et al.
patent: 3344425 (1966-06-01), Shelton
patent: 3624658 (1971-11-01), Voronoff
patent: 3828351 (1974-08-01), Voronoff
patent: 3949407 (1976-04-01), Jagdmann et al.
patent: 4309706 (1982-01-01), Mosko
patent: 4947178 (1990-08-01), Shafai

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